Kobayashi might say otherwise....
How much of that volume is fakes so that some Chinese exchanges can claim to be nr1 in the world?
One 1000 BTC drop and we went down 300$ last time,  I'm not that eager to see 4000BTC dumped at once.
But the feds will never sell the coins on an exchange with fluctuating prices.

You have reported 283 posts with 99% accuracy (267 good, 5 bad, 11 unhandled).

My partner was a gambling addict for many years, and I put up with it as much as I could for many years. We had talks about it. We had fights about it. Sometimes we went for weeks without speaking to each other. Many times after promising to quit, she'd quietly go back there and lose more money. The children would stay up until late into the night waiting for their mother to come home. Where's mommy? They'd wake up tired for school the next day. One night after she came home, something inside me snapped. I had enough!! I told her to get the F out of my house and to take all her crap with her. I told her that I'm going to divorce her and take the house and the kids. I told her that I have copies of all her bank statements showing how much money she's been squandering at casinos and that no judge in his right mind would give a gambling addict custody of the children, besides she was always broke. I was seeing red and I was fully prepared for the ugliest divorce and custody fight ever. Do you know what happened after that night? She quit gambling. It's been 6 months or so since that night, and I have to say thanks be to God for answering my prayers and bringing this whole ugly problem to an end. I've never been that angry with her before, and I guess that is what she needed to see before she quit. I showed her the brick wall that she was heading for and she slammed on the brakes.

Who are those acting  foolishness that will spend life saving to buy bitcoin?dont they know the motto of cryptonians?"Invest What You Can Afford to Lose"

If you dont know this and you made that foolish decision that's Craziness and Noob actions,neverbe that investor because it can kill lives

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b) what is the point of decentralised money, if its so volatile, that rate would drop 75% in 6 months (or grows by the same)? this is called a hyperinflation.

In economics, hyperinflation is very high and typically accelerating inflation. It quickly erodes the real value of the currency, as the prices of most or all goods increase. This causes people to minimize their holdings in that currency as they usually switch to more stable foreign currencies.[1] Prices typically remain stable in terms of other currencies.

Unlike low inflation, where the process of rising prices is protracted and not generally noticeable except by studying past market prices, hyperinflation sees a rapid and continuing increase in nominal prices, the nominal cost of goods, and in the supply of money.[2] Typically, however, the general price level rises even more rapidly than the money supply as people try ridding themselves of the devaluing currency as quickly as possible. As this happens, the real stock of money (i.e., the amount of circulating money divided by the price level) decreases considerably.[3]